Index: /issm/trunk-jpl/src/m/exp/isoline.m
===================================================================
--- /issm/trunk-jpl/src/m/exp/isoline.m	(revision 26928)
+++ /issm/trunk-jpl/src/m/exp/isoline.m	(revision 26929)
@@ -40,7 +40,11 @@
 if isempty(field), error('field provided is empty'); end
 if dimension(md.mesh)==3,
-	if length(field)~=md.mesh.numberofvertices2d, error('field provided should be specified at the vertices of the mesh'); end
-else
-	if length(field)~=md.mesh.numberofvertices, error('field provided should be specified at the vertices of the mesh'); end
+	if length(field)~=md.mesh.numberofvertices2d
+		error('field provided should be of size md.mesh.numberofvertices2d'); 
+	end
+else
+	if length(field)~=md.mesh.numberofvertices
+		error('field provided should be of size md.mesh.numberofvertices'); 
+	end
 end